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      <a id="GENtanh"></a>
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      <a id="IndexGENtanh" class="indexterm"></a>
      <div class="refnamediv">
        <h2>
          <span class="refentrytitle">GENtanh</span>
        </h2>
        <p>"tanh" — 
      Generate a table with values on the tanh function.
    </p>
      </div>
      <div class="refsect1">
        <a id="idp216053344"></a>
        <h2>Description</h2>
        <p>
      Creates an ftable with values of the tanh function.
    </p>
      </div>
      <div class="refsect1">
        <a id="idp216054608"></a>
        <h2>Syntax</h2>
        <pre class="synopsis"><span class="command"><strong>f</strong></span> # time size "tanh" start end rescale</pre>
      </div>
      <div class="refsect1">
        <a id="idp216130096"></a>
        <h2>Initialization</h2>
        <p>
      <span class="emphasis"><em>size</em></span> -- number of points in the table. Must
      be a power of 2 or power-of-2 plus 1 (see <a class="link" href="f.html" title="f Statement (or Function Table Statement)"><em class="citetitle">f statement</em></a>).
    </p>
        <p>
      <span class="emphasis"><em>start, end</em></span> -- first and last value to be stored; the GEN draws a curve that goes from start to end: tanh(start) .... tanh(end). The points stored are uniformly spaced between these to the table size
    </p>
        <p>
      <span class="emphasis"><em>rescale</em></span> -- if not zero the table is not rescaled
    </p>
      </div>
      <div class="refsect1">
        <a id="idp216134432"></a>
        <h2>Examples</h2>
        <p>
      Here is a simple example of the GENtanh routine. It uses the file <a class="ulink" href="examples/gentanh.csd" target="_top"><em class="citetitle">gentanh.csd</em></a>.
           </p>
        <div class="example">
          <a id="idp216136304"></a>
          <p class="title">
            <strong>Example 1127. Example of the GENtanh routine.</strong>
          </p>
          <div class="example-contents">
            <p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p>
            <pre class="programlisting">
<span class="csdtag">&lt;CsoundSynthesizer&gt;</span>
<span class="csdtag">&lt;CsOptions&gt;</span>
<span class="comment">; Select audio/midi flags here according to platform</span>
-odac  <span class="comment">;;;realtime audio out</span>
<span class="comment">;-iadc    ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o gentanh.wav -W ;;; for file output any platform</span>
<span class="csdtag">&lt;/CsOptions&gt;</span>
<span class="csdtag">&lt;CsInstruments&gt;</span>

<span class="ohdr">sr</span> <span class="op">=</span> 44100 
<span class="ohdr">ksmps</span> <span class="op">=</span> 32 
<span class="ohdr">nchnls</span> <span class="op">=</span> 2 
<span class="ohdr">0dbfs</span>  <span class="op">=</span> 1 

<span class="oblock">instr</span> 1

aswp	<span class="opc">linseg</span>	0.01, p3<span class="op">*</span>.5, .49, p3<span class="op">*</span>.5, 0.01		<span class="comment">;index sweep function</span>
aindex	<span class="opc">poscil</span>	aswp, 110, 1				<span class="comment">;sound to waveshape</span>
atable	<span class="opc">tablei</span>	aindex, p4, 1, .5			<span class="comment">;waveshape index</span>
aenv	<span class="opc">linen</span>	0.8, .01, p3, .02			<span class="comment">;amplitude envelope</span>
asig	<span class="op">=</span> (atable<span class="op">*</span>aenv)<span class="op">*</span>p5				<span class="comment">;impose envelope and scale</span>
asig    <span class="opc">dcblock2</span> asig					<span class="comment">;get rid of DC</span>
	<span class="opc">outs</span>    asig, asig

<span class="oblock">endin</span>		
<span class="csdtag">&lt;/CsInstruments&gt;</span>
<span class="csdtag">&lt;CsScore&gt;</span>
<span class="stamnt">f</span> 1 0 8192 10 1	<span class="comment">;sine wave</span>
<span class="stamnt">f</span> 2 0 8192 "tanh" -100 100 0	<span class="comment">;symmetrical transfer fuction</span>
<span class="stamnt">f</span> 3 0 8192 "tanh" -10  10  0	<span class="comment">;symmetrical</span>
<span class="stamnt">f</span> 4 0 8192 "tanh"   0  10  0	<span class="comment">;not symmetrical</span>

<span class="stamnt">i</span>1 0 3 2 1
<span class="stamnt">i</span>1 + 3 3 1
<span class="stamnt">i</span>1 + 3 4 2

<span class="stamnt">e</span>
<span class="csdtag">&lt;/CsScore&gt;</span>
<span class="csdtag">&lt;/CsoundSynthesizer&gt;</span>
</pre>
          </div>
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        <p><br class="example-break" />  
        <span class="phrase">These are the diagrams of the waveforms of the GENtanh routines, as used in the example:</span>

      </p>
        <div class="mediaobject">
          <img src="images/gentanh_1.png" alt="f 2 0 8192 &quot;tanh&quot; -100 100 0 - lots of distortion" />
          <div class="caption">
            <p>  f 2 0 8192 "tanh" -100 100 0 - lots of distortion</p>
          </div>
        </div>
        <p>

      </p>
        <div class="mediaobject">
          <img src="images/gentanh_2.png" alt="f 3 0 8192 &quot;tanh&quot; -10 10 0 - less distortion than f2" />
          <div class="caption">
            <p>  f 3 0 8192 "tanh" -10 10 0 - less distortion than f2</p>
          </div>
        </div>
        <p>

      </p>
        <div class="mediaobject">
          <img src="images/gentanh_3.png" alt="f 4 0 8192 &quot;tanh&quot; -10 15 0" />
          <div class="caption">
            <p>  f 4 0 8192 "tanh" -10 15 0</p>
          </div>
        </div>
        <p>
    </p>
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      <div class="refsect1">
        <a id="idp216150976"></a>
        <h2>See Also</h2>
        <p>
       <a class="link" href="GENexp.html" title="GENexp"><em class="citetitle">GENexp</em></a> and
       <a class="link" href="GENsone.html" title="GENsone"><em class="citetitle">GENsone</em></a>.
          </p>
        <p> More information on this routine: <a class="ulink" href="http://www.csoundjournal.com/issue11/distortionSynthesis.html" target="_top"><em class="citetitle">http://www.csoundjournal.com/issue11/distortionSynthesis.html</em></a>, written by Victor Lazzarini</p>
        <p>
     </p>
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      <div class="refsect1">
        <a id="idp216155472"></a>
        <h2>Credits</h2>
        <p>Written by John ffitch</p>
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